The upper graph, an oscillogram, displays the amplitude (loudness) of the call as vertical displacement on both sides of a horizontal
base line. [During silence, an oscillogram is a horizontal line.]

The lower graph, an audiospectrogram, displays amplitude as darkness of mark and frequency (pitch) as the height of the marks above a base line (not shown). The tick marks at the left of the audiospectrogram are at 1 kHz (1000 cycles per second) intervals. The value of the center (red) tick mark is in red above the graphs. Because the graph is made for maximum time discrimination (rather than for maximum frequency discrimination),
a continuous pure frequency would plot as a broad band about 0.8 kHz wide.

Above the oscillogram for each species are these items:

common name: linked to the home page for the species.

normal song: linked to a wav file of eight to 10 seconds of typical calling song.

slowed song: linked to a wav file of normal calling song slowed to 1/4 speed. You will have 8 seconds to listen to the same 2 seconds of calling song that is graphed. The carrier frequency (pitch) will be dropped to 1/4 normal. At this slow speed you can easily hear the pulses (tone bursts) that correspond to closing strokes of the forewings. To see an animation of the wing movement of a chirping field cricket, click here.